dnrd: Simple proxy nameserver1

The Domain Name Relay Daemon (DNRD) is a simple "proxy" nameserver.
It is meant to be used for home networks that can connect to the internet
using one of several ISP's.

DNRD is pretty simple. It takes DNS queries from hosts, and forwards them
to the "real" DNS server. It takes DNS replies from the DNS server, and
forwards them to the client. What makes DNRD special is that it can be
configured to forward to different DNS servers depending on what ISP you
are dialing.